Now Playing: Charlie Sheen: Watch the Full '20/20' Interview

Now Playing: Rants, Raves and Drugs

Now Playing: Career Suicide or Windfall?

Now Playing: Analyzing Sheen

Now Playing: Will Sheen Stay Clean?

Now Playing: Sheen on Sheen

Now Playing: JonBenet Ramsey's family still hopeful they'll find her killer someday: Part 11

Now Playing: How Det. Smit's family keeps the search for JonBenet Ramsey's killer going: Part 10

Now Playing: JonBenet Ramsey's parents cleared of her murder, Det. Lou Smit has dying wish: Part 9

Now Playing: Grand jury convenes in JonBenet Ramsey case 2 years after she's killed: Part 8

Now Playing: JonBenet Ramsey's parents are interrogated, DNA evidence is made public: Part 7

Now Playing: Legendary detective joins JonBenet Ramsey's murder investigation: Part 6

Now Playing: JonBenet Ramsey's parents deny involvement as police investigate the murder: Part 5

Now Playing: JonBenet Ramsey is buried in Georgia as case garners global media attention: Part 4

Now Playing: JonBenet Ramsey's father finds her dead in their basement: Part 3

Now Playing: JonBenet Ramsey's parents report a kidnapping, police search home: Part 2

Now Playing: The search for JonBenet Ramsey's killer continues 24 years later: Part 1

Now Playing: Granddaughters examine evidence collected by detective in JonBenet Ramsey case

Now Playing: JonBenet Ramsey’s half-brother says volunteers work 'daily' to find her killer

Now Playing: Family of detective dedicated to finding JonBenet Ramsey’s killer continues his work